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Table 1 Item locations and fit statistics for the 15 items of the FPDI function and pain subscales

From: A Rasch Analysis of the Manchester Foot Pain and Disability Index

  Location (SE) (logits) Item fit residual Chi-square probability F-test probability
Functioning Subscale     
1. Avoid walking outside 2.166 (0.223) -0.141 0.5146 0.6898
2. Avoid walking long distances -0.963 (0.160) -0.989 0.3109 0.1625
3. Don't walk in a normal way -0.082 (0.169) 0.984 0.2666 0.4895
4. Walk slowly -0.867 (0.164) -1.050 0.7594 0.4466
5. Have to stop and rest feet 0.115 (0.175) -0.941 0.3065 0.2227
6. Avoid hard or rough surfaces -1.339 (0.156) -0.374 0.6770 0.5616
7. Avoid standing for a long time -1.058 (0.165) -1.011 0.5779 0.4415
8. Catch the bus or use the car more often -0.897 (0.153) 0.809 0.2563 0.3129
9. Need help with housework or shopping 1.760 (0.208) -1.757 0.1866 0.0210
11. Get irritable when feet hurt 1.165 (0.191) 2.302 0.0416 0.0737
Pain Subscale     
10. Do everything with more pain or discomfort -0.868 (0.148) 1.682 0.2000 0.2046
14. Constant pain in feet -0.184 (0.147) -1.207 0.0275 0.0030*
15. Feet are worse in the morning 0.513 (0.150) 0.318 0.1979 0.2203
16. Feet more painful in the evening -0.201 (0.151) -0.478 0.2735 0.1327
17. Get shooting pains in feet 0.739 (0.154) 1.237 0.5830 0.6318
  1. * Significant misfit after Bonferroni correction